The key ingredients aren’t a state secret, but appear thoughtfully sourced. Fuggle, used in traditional British craft ales, honey from the New Territories, longan (dragon eye fruit) and carefully judged carbonation are supposed to make Betsy a win. If you'd like to sample what's touted as the world's first high-altitude ale, fly first or business from Hong Kong to London and Manchester from Mar 1 to April 30 or, when in Hong Kong, find Betsy in Mr & Mrs Fox, Café Gray Deluxe, Plat du Jour, Public, Sugar and The Continental or exlusively on deli-delight.com during March and April. Or, do what we'll do: head for the Cathay Pacific lounge in Hong Kong or Heathrow.

So who's Betsy named after? Cathay Pacific’s first aircraft, a Douglas DC-3 which flew passengers around the region in the 1940s and 1950s. Those were happening times.